Calendar

Oct
19
Fri
Colloquium: Sanchayeeta Borthakur (Host: Kristian Finlator)
Oct 19 @ 3:15 pm – 4:15 pm
Colloquium:  Sanchayeeta Borthakur (Host: Kristian Finlator) @ BX102

Understanding How Galaxies Reionized the Universe

 Sanchayeeta Borthakur, Arizona State University

Identifying the population of galaxies that was responsible for the reionization of the universe is a long-standing quest in astronomy. While young stars can produce large amounts of ionizing photons, the mechanism behind the escape of Lyman continuum photons (wavelength < 912 A) from star-forming regions has eluded us. To identify such galaxies and to understand the process of the escape of Lyman continuum, we present an indirect technique known as the residual flux technique. Using this technique, we identified (and later confirmed) the first low-redshift galaxy that has an escape fraction of ionizing flux of 21%. This leaky galaxy provides us with valuable insights into the physics of starburst-driven feedback. In addition, since direct detection of ionizing flux is impossible at the epoch of reionization, the residual flux technique presents a highly valuable tool for future studies to be conducted with the upcoming large telescopes such as the JWST.

Observatory Open House
Oct 19 @ 8:00 pm – 9:00 pm
Observatory Open House

Host: James McAteer. Assisted by Laurel Farris, Kristen Luchsinger, and Matthew Varakian

Oct
25
Thu
Inclusive Astronomy
Oct 25 @ 4:00 pm – 5:00 pm
Nov
1
Thu
Inclusive Astronomy
Nov 1 @ 4:00 pm – 5:00 pm
Nov
2
Fri
Colloquium: Kate Follette (Host: Moire Prescott)
Nov 2 @ 3:15 pm – 4:15 pm
Colloquium: Kate Follette (Host: Moire Prescott) @ BX102

How to Take Pictures of Baby Planets

Kate Follette, Amherst College

Of the thousands of known extrasolar planets, why are the dozen or so directly imaged exoplanets among the most important despite their apparently anomalous properties within the general exoplanet population (>10 astronomical units, >2x the mass of Jupiter)? What are the prospects for (and recent successes in) detecting younger, lower-mass and/or closer-in planets via direct imaging? I will discuss the current state of the art in the field of high-contrast imaging of extrasolar planets and the disks of gas and dust from which planets form (“circumstellar disks”). I will place particular emphasis on a subset of objects that host both disks and (likely) planets – the so-called “transitional disks”. These young circumstellar disks are almost certainly actively undergoing planet formation, and yet the presence of disk material complicates our ability to isolate light from planets and/or protoplanets embedded within them. I will end by discussing recent results from the Giant Accreting Protoplanet Survey (GAPplanetS) of 15 southern-hemisphere transition disks. The GAPlanetS survey aims to find protoplanets embedded in transitional disks through a distinctive signature at hydrogen wavelengths, and has so far discovered: 2-3 planets, 1 accreting M-dwarf stellar companion, and 1 disk feature masquerading as a planet.

Nov
5
Mon
Pizza lunch: Heidi Sanchez
Nov 5 @ 12:30 pm – 1:30 pm
Pizza lunch: Heidi Sanchez @ AY 119

The Sunspot Solar Observatory Visitor Center

Heidi Sanchez, Sunspot Solar Observatory, NMSU

Nov
8
Thu
Inclusive Astronomy
Nov 8 @ 4:00 pm – 5:00 pm
Nov
9
Fri
Colloquium: Laura Chomiuk (Host: Moire Prescott)
Nov 9 @ 3:15 pm – 4:15 pm
Colloquium: Laura Chomiuk (Host: Moire Prescott) @ BX102

Rethinking the Fundamentals of Classical Nova Explosions

Laura Chomiuk, MSU

Over the past few years, a revolution has been taking place in our understanding of classical novae, largely driven by the discovery of GeV gamma-rays emanating from these garden-variety explosions. These gamma-rays hint that shocks are energetically important—perhaps even dominant—in novae. I will present our burgeoning understanding of shocks in novae, from both multi-wavelength observational and theoretical perspectives, and illustrate how novae can be used as testbeds to understand other shock-powered explosions.

Nov
12
Mon
Pizza lunch: Nur Berdalieva and Shukur Kholikov
Nov 12 @ 12:30 pm – 1:30 pm
Pizza lunch: Nur Berdalieva and Shukur Kholikov @ AY 119

Past and Present Astronomy in Uzbekistan

Nur Berdalieva (Astronomical Institute of Uzbekistan) and Shukur Kholikov (National Solar Observatory)

Nov
15
Thu
Inclusive Astronomy
Nov 15 @ 4:00 pm – 5:00 pm